Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry.
Permafrost-affected soils cover about 40–45 % of Canada. The environment in such areas, especially those located within the discontinuous permafrost zone, has been impacted more than any other by recorded climatic changes. A number of changes, such as surface subsidence and the degradation of frost...
Published in: | Earth Surface Dynamics |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2015
|
Subjects: | |
Online Access: | https://espace.inrs.ca/id/eprint/4364/ https://espace.inrs.ca/id/eprint/4364/1/P2902.pdf https://doi.org/10.5194/esurf-3-409-2015 |
id |
ftinrsquebec:oai:espace.inrs.ca:4364 |
---|---|
record_format |
openpolar |
spelling |
ftinrsquebec:oai:espace.inrs.ca:4364 2023-07-02T03:33:24+02:00 Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. Beck, Inga Ludwig, Ralf Peter Bernier, Monique Strozzi, Tazio Boike, Julia 2015 application/pdf https://espace.inrs.ca/id/eprint/4364/ https://espace.inrs.ca/id/eprint/4364/1/P2902.pdf https://doi.org/10.5194/esurf-3-409-2015 en eng https://espace.inrs.ca/id/eprint/4364/1/P2902.pdf Beck, Inga, Ludwig, Ralf Peter, Bernier, Monique, Strozzi, Tazio et Boike, Julia (2015). Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. Earth Surface Dynamics , vol. 3 , nº 3. p. 409-421. DOI:10.5194/esurf-3-409-2015 <https://doi.org/10.5194/esurf-3-409-2015>. doi:10.5194/esurf-3-409-2015 radar interferometry northern Quebec Canada Alaska palsa subsidence vegetation thickness lithalsas Article Évalué par les pairs 2015 ftinrsquebec https://doi.org/10.5194/esurf-3-409-2015 2023-06-10T23:12:39Z Permafrost-affected soils cover about 40–45 % of Canada. The environment in such areas, especially those located within the discontinuous permafrost zone, has been impacted more than any other by recorded climatic changes. A number of changes, such as surface subsidence and the degradation of frost mounds due to permafrost thawing, have already been observed at many locations. We surveyed three frost mounds (lithalsas) in the subarctic, close to Umiujaq in northern Quebec, using high-precision differential global positioning system (d-GPS) technology during field visits in 2009, 2010 and 2011, thus obtaining detailed information on their responses to the freezing and thawing that occur during the course of the annual temperature cycle. Seasonal pulsations were detected in the frost mounds, and these responses were shown to vary with their state of degradation and the land cover. The most degraded lithalsa showed a maximum amplitude of vertical movement (either up or down) between winter (freezing) and summer (thawing) of 0.19 ± 0.09 m over the study period, while for the least degraded lithalsa this figure was far greater (1.24 ± 0.47 m). Records from areas with little or no vegetation showed far less average vertical movement over the study period (0.17 ± 0.03 m) than those with prostrate shrubs (0.56 ± 0.02 m), suggesting an influence from the land cover. A differential interferometric synthetic aperture radar (D-InSAR) analysis was also completed over the lithalsas using selected TerraSAR-X images acquired from April to October 2009 and from March to October 2010, with a repeat cycle of 11 days. Interferograms with baselines shorter than 200 m were computed revealing a generally very low interferometric coherence, restricting the quantification of vertical movements of the lithalsas. Vertical surface movements of the order of a few centimeters were recorded in the vicinity of Umiujaq. Article in Journal/Newspaper palsa permafrost Subarctic Umiujaq Alaska Institut national de la recherche scientifique, Québec: Espace INRS Canada Umiujaq ENVELOPE(-76.549,-76.549,56.553,56.553) Earth Surface Dynamics 3 3 409 421 |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
English |
topic |
radar interferometry northern Quebec Canada Alaska palsa subsidence vegetation thickness lithalsas |
spellingShingle |
radar interferometry northern Quebec Canada Alaska palsa subsidence vegetation thickness lithalsas Beck, Inga Ludwig, Ralf Peter Bernier, Monique Strozzi, Tazio Boike, Julia Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. |
topic_facet |
radar interferometry northern Quebec Canada Alaska palsa subsidence vegetation thickness lithalsas |
description |
Permafrost-affected soils cover about 40–45 % of Canada. The environment in such areas, especially those located within the discontinuous permafrost zone, has been impacted more than any other by recorded climatic changes. A number of changes, such as surface subsidence and the degradation of frost mounds due to permafrost thawing, have already been observed at many locations. We surveyed three frost mounds (lithalsas) in the subarctic, close to Umiujaq in northern Quebec, using high-precision differential global positioning system (d-GPS) technology during field visits in 2009, 2010 and 2011, thus obtaining detailed information on their responses to the freezing and thawing that occur during the course of the annual temperature cycle. Seasonal pulsations were detected in the frost mounds, and these responses were shown to vary with their state of degradation and the land cover. The most degraded lithalsa showed a maximum amplitude of vertical movement (either up or down) between winter (freezing) and summer (thawing) of 0.19 ± 0.09 m over the study period, while for the least degraded lithalsa this figure was far greater (1.24 ± 0.47 m). Records from areas with little or no vegetation showed far less average vertical movement over the study period (0.17 ± 0.03 m) than those with prostrate shrubs (0.56 ± 0.02 m), suggesting an influence from the land cover. A differential interferometric synthetic aperture radar (D-InSAR) analysis was also completed over the lithalsas using selected TerraSAR-X images acquired from April to October 2009 and from March to October 2010, with a repeat cycle of 11 days. Interferograms with baselines shorter than 200 m were computed revealing a generally very low interferometric coherence, restricting the quantification of vertical movements of the lithalsas. Vertical surface movements of the order of a few centimeters were recorded in the vicinity of Umiujaq. |
format |
Article in Journal/Newspaper |
author |
Beck, Inga Ludwig, Ralf Peter Bernier, Monique Strozzi, Tazio Boike, Julia |
author_facet |
Beck, Inga Ludwig, Ralf Peter Bernier, Monique Strozzi, Tazio Boike, Julia |
author_sort |
Beck, Inga |
title |
Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. |
title_short |
Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. |
title_full |
Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. |
title_fullStr |
Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. |
title_full_unstemmed |
Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. |
title_sort |
vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. |
publishDate |
2015 |
url |
https://espace.inrs.ca/id/eprint/4364/ https://espace.inrs.ca/id/eprint/4364/1/P2902.pdf https://doi.org/10.5194/esurf-3-409-2015 |
long_lat |
ENVELOPE(-76.549,-76.549,56.553,56.553) |
geographic |
Canada Umiujaq |
geographic_facet |
Canada Umiujaq |
genre |
palsa permafrost Subarctic Umiujaq Alaska |
genre_facet |
palsa permafrost Subarctic Umiujaq Alaska |
op_relation |
https://espace.inrs.ca/id/eprint/4364/1/P2902.pdf Beck, Inga, Ludwig, Ralf Peter, Bernier, Monique, Strozzi, Tazio et Boike, Julia (2015). Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry. Earth Surface Dynamics , vol. 3 , nº 3. p. 409-421. DOI:10.5194/esurf-3-409-2015 <https://doi.org/10.5194/esurf-3-409-2015>. doi:10.5194/esurf-3-409-2015 |
op_doi |
https://doi.org/10.5194/esurf-3-409-2015 |
container_title |
Earth Surface Dynamics |
container_volume |
3 |
container_issue |
3 |
container_start_page |
409 |
op_container_end_page |
421 |
_version_ |
1770273343342116864 |